Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 100,169	$ 134,565
Trade accounts receivable, net of allowance of $3,559 and $2,780, respectively	211,909	209,100
Accounts receivable-related parties	48	52
Income tax receivable	3,529	2,553
Inventories	38,292	40,230
Prepaid expenses	12,845	8,796
Other current assets	8,762	13,891
Deferred tax assets	41,047	32,201
Total current assets	416,601	441,388
Property and equipment, net	932,505	943,766
Deferred debt costs, net of amortization	16,928	18,733
Goodwill	110,280	105,836
Other intangible assets, net of amortization	79,328	82,762
Other assets	6,440	6,521
Total assets	1,562,082	1,599,006
Current liabilities:
Accounts payable	49,444	61,740
Accrued expenses	78,617	81,076
Current portion of long-term debt	39,895	38,235
Other current liabilities	338	306
Total current liabilities	168,294	181,357
Long-term debt, net of unamortized premium on notes of $1,517 and $1,683, respectively	845,053	844,906
Deferred tax liabilities	178,533	185,101
Other long-term liabilities	20,616	15,232
Commitments and contingencies
Stockholders' equity:
Preferred stock; $0.01 par value; 5,000,000 shares authorized; none designated or issued at September 30, 2013 and December 31, 2012
Common stock; $0.01 par value; 80,000,000 shares authorized; 43,500,032 shares issued and 42,199,743 shares outstanding at September 30, 2013; 43,500,032 shares issued and 41,721,299 shares outstanding at December 31, 2012	435	435
Additional paid-in capital	361,012	359,160
Retained earnings	673	29,203
Treasury stock, at cost, 1,300,289 and 1,778,803 shares at September 30, 2013 and December 31, 2012, respectively	(12,534)	(16,388)
Total stockholders' equity	349,586	372,410
Total liabilities and stockholders' equity	$ 1,562,082	$ 1,599,006